Gypsum board is a new type of material developed in recent years. Due to its low energy consumption, high production efficiency, light weight, thermal insulation, fire prevention, sound insulation, decorative construction, comfort, environmental protection, space saving and other superior performance, it is widely used in various projects but paper plaster Cracking at the joints of the plates is common. Although mesh belts, paper tapes, cavities and other materials are used to prevent cracking, they cannot be completely cured.
The reason for the cracking of the gypsum board ceiling board is caused.
I. Material reasons 
1. Skeleton Materials  Skeleton materials include keels, booms and other accessories. If the quality of the skeleton material is not up to the requirement, it will directly affect the firmness of the entire skeleton, which is an important cause of cracking and deformation of the ceiling. For example, if the rigidity and straightness of the keel and the boom are not enough, the internal stress will be generated. The internal stress will inevitably cause deformation and cracking during the release process. 
2. Gypsum board gypsum board gypsum board is a cladding material. It is made of high-strength self-tapping screws and light steel keels. If the gypsum board does not meet the quality requirements, it will not be firm between the gypsum board and the keel. When the ground is fixed, when there is an external force, the joint of the gypsum board will produce shearing force, which will cause the joint of the board to crack.
3. Caulking material  caulking material includes seam belt and caulking putty. Seams are required to have good adhesion and strength. The caulking putty not only requires good strength and cohesiveness, but also has certain toughness and good construction performance. If the above properties are not achieved, cracks will inevitably occur.
4. The boom and the boom itself are bent. After being installed for a period of time, the concrete is gradually straightened under the gravity of the plate, causing uneven sag of the keel and gypsum board to cause cracks at the joint.
2. Construction reasons 
1. The construction process is not standardized. The construction is not in accordance with the design requirements. The construction is not in accordance with the operation rules. The interface between the raft and the plate is not required to be sewed. The large-area construction slab is not staggered. The fastening screw is short or the sparse plaque. Insufficient or too soft, flat, negative, and negative angles are not attached or wrap angles. Both will reduce the rigidity and firmness of the overall frame, generate internal stress, cause deformation and even cause joint cracking.
2. The arrangement of the keel is unreasonable. The construction of the keel is not strictly in accordance with the drawings and the relevant national regulations. The design parameters are arbitrarily changed. For example, the distance between the keel and the boom is increased, the material size is reduced, or the space for interference with obstacles is not made. The design of the bridge bracket or the insufficient rigidity of the bracket may cause cracks at the joint.
3. There is no protection for semi-finished products and finished products. After the ceiling is installed, the squatter is placed on the dragon skeleton and even stepped on the secondary keel to produce vibration. The deformation of the skeleton occurs and the joint is cracked.
Human factors
It goes without saying that the construction unit is motivated to reduce the quality requirements under the ideology of pursuing the best interests. The hand and foot on the construction materials are small and full, thin and thick, fake and true, and shoddy. The most outstanding performance is to cut corners on the keel, hanging ribs and hanging pieces. These materials are in the scope of concealed engineering inspections, and the concealment is stronger. The quality hazard is greater, and it is not easy to find problems. Reconstruction: In the place where the bridge bracket must be made, it is not constructed according to the design requirements, but it is randomly connected to the fixed pipe network, equipment bracket, and hanger hanger. When the equipment is in normal operation, the lifting rib and the keel vibration cause the board. The seams are cracked.
4. Improper protection measures
1. Cohesive work is not coordinated, chaotic operations, mutual interference, and subsequent processes do not pay attention to the protection of semi-finished products and finished products. Barbaric construction, especially concealed works. 直接 Direct damage to completed projects. 
2. There is no protective measure in the opening of the lamp, and the crack in the crack occurs due to the vibration of the ceiling.
3. After the completion of the completion of the overall project, due to the concealed pipelines and equipment inside the repairing and repairing, the operation of the finished project is not carried out, and the protective measures of the finished product are not carried out, causing deformation of the keel or damage to the finish, which may cause cracking of the joint. .
4. During the construction or installation of the board, due to the long time of the gypsum board or the continuous moisture-immersed wetting volume expansion deformation, the gypsum board is cracked at the joint due to natural drying shrinkage after installation.
V. Environmental impact
Most projects can hardly find cracks that affect the quality of the look and feel when they are completed and delivered, but it will not be long before the cracks are revealed and expanded. The reason is caused by changes in environmental conditions. Usually the construction is carried out in a natural environment. The temperature and humidity inside and outside the room cannot be a constant value throughout the year. Especially under the influence of negative effects such as indoor air conditioning and heating, the humidity of the air is lowered. This situation is different from the original construction conditions. The original temperature and humidity balance in the plasterboard is destroyed. Cracks appear in the shrinkage.
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